[AC 21.5] Fix -Kalloca detection

APPROVE COMMIT 21.5 Thanks to Ilya Golubev for catching this one. This is another mistake from my recent update to configure.ac. I have checked every use of AC_LANG_SOURCE and this is the only remaining incorrect one. ChangeLog addition: 2006-03-30 Jerry James <james(a)xemacs.org&gt; * configure.ac: Fix for -Kalloca detection, also broken by the recent autoconf updates. Thanks to Ilya Golubev. xemacs-21.5 source patch: Diff command: cvs -q diff -uN Files affected: configure.ac Index: configure.ac =================================================================== RCS file: /pack/xemacscvs/XEmacs/xemacs/configure.ac,v retrieving revision 1.39 diff -d -u -r1.39 configure.ac --- configure.ac 2006/03/30 16:22:27 1.39 +++ configure.ac 2006/03/30 18:04:14 ＠＠ -2184,10 +2184,10 ＠＠ if test "$__USLC__" = yes; then AC_MSG_CHECKING(for whether the -Kalloca compiler flag is needed) need_kalloca=no - AC_LINK_IFELSE([AC_LANG_SOURCE([void *x = alloca(4);])], [:], [ + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [void *x = alloca(4);])], [:], [ xe_save_c_switch_system="$c_switch_system" c_switch_system="$c_switch_system -Kalloca" - AC_LINK_IFELSE([AC_LANG_SOURCE([void *x = alloca(4);])], + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [void *x = alloca(4);])], [ need_kalloca=yes ]) c_switch_system="$xe_save_c_switch_system"]) AC_MSG_RESULT($need_kalloca) -- Jerry James, Assistant Professor james(a)xemacs.org Computer Science Department http://www.cs.usu.edu/~jerry/ Utah State University